Engineering Manual

General Information
ELECTRICAL CONNECTIONS
Always have a trained service provider properly ground the outdoor unit. If the outdoor unit is not properly grounded, there is a risk of electric shock,
physical injury, or death.
• Use a conduit for the communications / connection (power) cable from the outdoor unit to the indoor units and branch distribution unit(s).
Electrical interference my cause product malfunction.
• The communications / connection (power) cable from the outdoor unit to the indoor units / branch distribution unit(s) should be separated and
isolated from power wiring to the outdoor unit, computers, radio and television broadcasting facilities, as well as medical imaging equipment.
Electrical interference my cause product malfunction.
• Multi F Systems:
• All communication / connection (power) cable from the outdoor unit to the indoor
unit to be minimum 18 AWG, four (4) conductor, stranded, shielded or unshielded (if
shielded, it must be grounded to the chassis of the outdoor unit only), and must com-
ply with applicable local and national codes.
• Multi F MAX Systems:
• All communication / connection (power) cable from the outdoor unit to the branch
distribution unit(s) to be minimum 16 AWG, four (4) conductor, stranded, shielded or
unshielded (if shielded, it must be grounded to the chassis of the outdoor unit only),
and must comply with applicable local and national codes.
• All communication / connection (power) cable from the branch distribution unit(s) to
the indoor units to be minimum 18 AWG, four (4) conductor, stranded, shielded or
unshielded (if shielded, it must be grounded to the chassis of the outdoor unit only),
and must comply with applicable local and national codes.
• Insulation material as required by local code.
• Rated for continuous exposure of temperatures up to 140°F.
• Firmly attach the cable; provide slack but secure in a way to prevent external forces from being imparted on the terminal block.
• Wiring should be completed without splices.
Communication / Connection (Power) Cable Specifications
• Multi F systems operate at 1Ø, 208-230V, 60Hz, and power is wired to the outdoor unit
only. The outdoor unit will supply power to the indoor units and the branch distribution
units (Multi F MAX systems only) through the communication / connection (power) cable.
• Power supply to the outdoor unit should be selected based on NEC and local codes.
Maximum allowable voltage fluctuation ±10% or nameplate rated value.
• Power wiring to the outdoor unit(s) should be solid or stranded, and must comply with all
local and national electrical codes.
• Properly ground the outdoor unit and indoor unit per NEC and local codes.
• Ground wire should be longer than the common power / communication wires.
• Connect the wiring firmly so the wires cannot be easily pulled out.
• Refer to the inside of the chassis cover or control cover for circuit and terminal block
diagrams.
• Always match color codes of each wire and follow wiring diagram.
• Do not install power wiring to the outdoor unit and the communication / connection (power) cable to the indoor unit in the same conduit.
Use separate conduits.
Power Supply / Power Wiring Specifications
Figure 260: Multi F / Multi F MAX Outdoor Unit
Power Wiring.
7/16" ± 1/8"
13/16
"
GN/YL
Power Wiring, Ground
to Outdoor Unit
Power Wiring, Ground,
Communication Cable
From Outdoor Unit
To Indoor Unit or from the
Outdoor Unit to the Branch
Distribution Unit
13/16”
GN/YL
GN/YL = (Ground, Yellow)
7/16" ± 1/8"
Figure 261:Multi F / Multi F MAX Outdoor and
Indoor / Branch Distribution Unit Wiring and Com-
munications Cable Diagram.
7/16" ± 1/8"
13/16
"
GN/YL
Power Wiring, Ground
to Outdoor Unit
Power Wiring, Ground,
Communication Cable
From Outdoor Unit
To Indoor Unit or from the
Outdoor Unit to the Branch
Distribution Unit
13/16”
GN/YL
GN/YL = (Ground, Yellow)
7/16" ± 1/8"
Due to our policy of continuous product innovation, some specications may change without notication.
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WIRING CONNECTIONS | 205
Wiring Connections
MULTI
F
MAX
MULTI
F